Datasheet

MAX4539/MAX4540
Low-Voltage, Single 8-to-1 and
Dual 4-to-1 Cal-Multiplexers
______________________________________________________________________________________ 15
∆V
OUT
V+
0V
LOGIC
INPUT
V
EN
+5V
V
COM
-5V
GND
V+
A1
V-
A0
EN
COM
MAX4539
C
L
= 1nF
V
COM
NO_
CHANNEL
SELECT
R
S
V
S
OFFON ON
∆V
OUT
IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ∆V
OUT
x C
L
A2
CAL
LATCH
∆V
OUT
V+
0V
LOGIC
INPUT
V
EN
+5V
V
COM
_
GND
V+
A1
V-
A0
EN
COMA
MAX4540
C
L
= 1nF
V
COM
NO_
CHANNEL
SELECT
R
S
V
S
OFFON ON
∆V
OUT
IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ∆V
OUT
x C
L
CAL
LATCH
-5V
Figure 4. Charge Injection
Test Circuits/Timing Diagrams (continued)
MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM AND “OFF” TERMINAL ON EACH SWITCH.
ON LOSS IS MEASURED BETWEEN COM AND “ON” TERMINAL ON EACH SWITCH.
NOTES:
+5V
V+
V+
V
COM
GND
V-
CALLATCH
+5V
10nF
V+
A
EN
NO_
COM_
V
IN
MAX4539
MAX4540
OFF ISOLATION = 20log
V
OUT
V
IN
CROSSTALK = 20log
V
OUT
V
IN
NETWORK
ANALYZER
50Ω
50Ω 50Ω
50Ω
MEAS. REF
10nF
Figure 5. Off-Isolation/Crosstalk